How does the hybrid engine system work in an Audi A7?

I am considering purchasing an Audi A7 with a hybrid engine system. Can someone explain how it works and what are the benefits of owning a hybrid car?

The Audi A7's hybrid engine utilizes a combination of an electric motor and gasoline engine. The electric motor provides additional power when needed and can also recharge the battery while driving. This results in improved fuel efficiency and reduced emissions.